Hi all, I am the owner of a mitsubishi lancer with 4g63 engine anf also have evo7 ecu fitted to it too.I bauht the openport cable too.which is the best thing to do first, to read from ecu?and than save as it and edit it?

Correct. Save a copy of your current/original ROM before you do anything else. If it all goes pear-shaped, you can just put it back to how it is now. And make a backup. These ROMs have security codes specific to your car, so if you lose it, you'll be stuck with a car that doesn't work.Start tuning from a copy of your ROM.